Answer:
3CuCl₂ + 2Na₃PO₄ → Cu₃(PO₄)₂ + 6NaCl
Explanation:
The reaction expression is given as:
CuCl₂ + Na₃PO₄ → Cu₃(PO₄)₂ + NaCl
To balance this expression, let us assign coefficients a, b, c and d;
aCuCl₂ + bNa₃PO₄ → cCu₃(PO₄)₂ + dNaCl
Conserving Cu: a = 3c
Cl: 2a = d
Na: 3b = d
P: b = 2c
O: 4b = 8c
let as c = 1, a = 3, d = 6 , b = 2
3CuCl₂ + 2Na₃PO₄ → Cu₃(PO₄)₂ + 6NaCl
How many products are produced in the following equation.
C2H2N2O4 + O2 → 4 CO2 + 2 H2O + 2 N2
Answer:
There are three products;carbon(IV)oxide,water and dinitogen and the number of molecules are given
How far can a S-wave travel in 16 minutes?
Answer:
1500 meters per second
Explanation:
which is 15 football fields
Answer:
1 to 8 km per second.
I need help pls and thank you
3. Heating by direct contact between particles is called
Summary If you were a conservation scientist, what would you like most about your job?
Explanation:
A conservationist is someone who advocates and champions the cause to protect the environment and use earth's resource in a sustainable way.
One of the interesting perks of being a conservationist is the ability to preserve pristine nature.
This aspect would most fascinate me. The joy of having to enact laws and policies that would preserve very vital aspect of the ecosystem would such a great delight. Also, having to champion the cause of indigenous people in whose voices are not often disseminated is a good catch
Help Determine the number of lead (Pb) atoms that could fit into a 3.0 L container if the density of lead is 11.34 g/cm3
Show work pls
Explanation: You know that the mass of an individual lead atom is equal to
3.4
⋅
10
−
22
grams.
A substance's density tells you what its mass per unit of volume is. In this case, you know that lead has a density of
11.3 g/cm
3
, which means that each
cm
3
of lead will have a mass of
11.3 g
.
Now, your cube has a volume of
2.00 cm
3
, which means that its mass will be equal to
2.00
cm
3
⋅
density
11.3 g
1
cm
3
=
22.6 g
Now all you have to do is look at the mass of one lead atom and figure out exactly how many lead atoms would be needed to make the total mass of the cube equal to
22.6 g
.
22.6
g
⋅
the mass per atom
1 lead atom
3.4
⋅
10
−
22
g
=
6.647
⋅
10
22
lead atoms
Rounded to two sig figs, the number of sig figs you have for the mass of an individual lead atom, the answer will be
no. of lead atoms
=
6.6
⋅
10
22
atoms
You can double-check this result by using lead's molar mass, which tells you what the exact mass of one mole of lead is.
22.6
g
⋅
1 mole Pb
207.2
g
=
0.1091 moles Pb
Now use Avogadro's number to determine how many atoms of lead you have in that many moles
0.1091
moles
⋅
6.022
⋅
10
23
atoms
1
mole
=
6.57
⋅
10
22
atoms
To two sig figs, you will once again get
no. of lead atoms
=
Which of the following is NOT evidence of a chemical reaction
A. rotting food
B. wax burning in a candle
C. Bubbles forming when Alka Seltzer is placed in water
D. Steam from your shower condensing into water droplets on your mirror
Answer:
a I believe
Explanation:
Have a good day
What happens when two magnets rappel each other hehe
Answer:
Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet’s north pole points (almost) towards the north direction.
This is because the Earth’s core (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth’s magnetic core, so it points north. That’s how a magnetic compass works.
Which of the following is NOT an
example of a pure substance?
A. an element on the periodic table
B. a compound made up of chemically-bonded
elements
C. a glass of salt water
Answer:
C would be the answer this question
Help me pls ASAP if you know it thank you!
Answer:ASEXUAL: Single parent, Genetically identical, Replication,Budding, splitting / splicing and plant cutting propogation SEXUAL: Two parents, genetically unique, Humans and Cows
Explanationasexual is one parent or stays the same, sexual is where two combine
Please need help with chemistry questions!!!
Answer:
will you like work ot just the answers
David heats a beaker of water for 5 min. Then he removes the beaker from the heat and allows it to cool. As the beaker cools, David measures the temperature of the water every minute for 15 min. Which equipment indicates the temperature?
Answer:
Thermometer
Explanation:
The equipment that indicates the temperature of the reaction is a thermometer.
A thermometer is a device used to measure the temperature of a body.
Most scientists use the thermometer to quantity the magnitude of the temperature of a body. There are different types of thermometer which depends on the type of temperature reading we want to collect.Temperature is the degree of hotness or coldness of a body.
Answer:
thermometer
Explanation:
How many atoms are in 30 grams of sulfur?
Answer:
l think,probably 6.022 X 1023
Answer:
0.93559956338688
Explanation:
*25 POINTS PLEASE HELP ASAP!!!*
What happens when elements chemically combine?
1) All elements retain their original properties
2) New properties are formed
3) Only metals retain their original properties
4) New elements are formed
Answer: b
Explanation:
Determine the mass of 21.05 moles of iron(III) sulfide.
Answer:
The mass of 21.05 moles of iron(III) sulfide is 4,372.085 grams.
Explanation:
Iron (III) sulfide is a chemical compound with the formula Fe₂S₃.
Being the molar mass of the elements:
Fe: 55.85 g/moleS: 32 g/molethen the molar mass of iron sulfide (III) is:
Fe₂S₃= 2* 55.85 g/mole + 3* 32 g/mole= 207.7 g/mole
Molar mass is the amount of mass that a substance contains in one mole. Then the rule of three can be applied: if in 1 mole of iron (III) sulfide there are 207.7 grams, in 21.05 moles how much mass is there?
[tex]mass=\frac{21.05 moles*207.7 grams}{1 mole}[/tex]
mass= 4,372.085 grams
The mass of 21.05 moles of iron(III) sulfide is 4,372.085 grams.
HELP PLS I WILL GIVE 40 POINTS!!!!
Which statement is true about all physical change?
The molecular composition of the substance remains unchanged.
The changed substance keeps all the same properties.
A permanent change in the substance has taken place.
Atoms rearrange to form a new substance.
how a cold front affects weather.
Answer:
A cold front forms when a cold air mass pushes into a warmer air mass. Cold fronts can produce dramatic changes in the weather. ... As the cold front passes, winds become gusty. There is a sudden drop in temperature, and also heavy rain, sometimes with hail, thunder, and lightning.
Answer:
Explanation:A cold front forms when a cold air mass pushes into a warmer air mass. Cold fronts can produce dramatic changes in the weather. As the cold front passes, winds become gusty. There is a sudden drop in temperature, and also heavy rain, sometimes with hail, thunder, and lightning.
Please I need this answer
Answer:
wave c i think
Explanation:
Complete the sentence. When an acid is added to water, hydrogen ions __________.
A) increase
B) decrease
C) stay the same
D) disappear
Answer:
Increases
Explanation:
1. Do you think that the lightbulb and the Moon spheres are "to scale" compared to the real
sizes of the sun and the Moon?
Answer:
Yes
Explanation: Had a question like this and I said yes and got it right
Write the formula for silicon pentabromide.
That would be SiBr4, hope this helps ^^
Silicon pentabromide has the formula SiBr₅ . It is a covalent compound formed by electron sharing between Si and Br atoms.
What is silicon pentabromide?Silicon pentabromide is a covalent compound formed by sharing of electrons between Si and Br atoms. Silicon is 14th group element and it has 4 valence electrons. It needs 4 more electrons to achieve octet.
Br is 17th group element having 7 valence electrons. It needs 1 more electron to achieve octet. Thus, it combines with other atoms by gaining or sharing electrons.
The compound SiBr₅ is in fact does not exist. Because Si does not have 5 electrons in its valence shell to share with each Br. But Br can share its one electron with Si, and Si will gain 9 electrons in its valence shell and thus deviates from rule of octet.
To find more on octet rule, refer here:
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A balloon is inflated to a volume of 1.25L .If the temperature of the air inside is cooled from 35°C to 15°C , what will be the final volume of the balloon?
Answer:
V₂ = 1.17 L
Explanation:
Given data:
Initial volume of balloon = 1.25 L
Initial temperature = 35°C
Final temperature = 15°C
Final volume = ?
Solution:
Initial temperature = 35°C (35+273.15K = 308.15 K)
Final temperature = 15°C (15+273.15 K = 288.15 K)
The given problem will be solve through the Charles Law.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 1.25 L × 288.15 K / 308.15 k
V₂ = 360.2 L.K / 308.15 k
V₂ = 1.17 L
In a molecule of fluorine, the two shared electrons give each fluorine atom how many electron(s) in the outer energy level
Answer:
8 electrons
Explanation:
As per the octet rule, the atoms possess a tendency to bond in a manner that every atom must have at least eight(8) electrons in its outermost/valence shell. It can be done either by sharing, gaining, or losing electrons from one atom to another. According to this rule, flourine would have 8 electrons in its outer shell after two shared electrons are given to it.
There should be 8 electrons in the outer energy level.
The following information should be considered:
According to the octet rule, the atoms possess a tendency to bond in a manner that each & every atom should have minimum eight(8) electrons in its outermost/valence shell. It could be done via by sharing, gaining, or losing electrons from one atom to another.Learn more: brainly.com/question/17429689
PLEASE HELP!!! Which type of substance is gold an example of?
A. an alloy
B. a compound
C. a molecule
D. an element
Answer:
Hello!
Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element.
So in short, the Correct Answer will be (D) an Element.
Hope that Helps! Have A Wonderful Day! ☺
Explanation:
Gold is an example of chemical element with symbol Au aurum and atomic number 79, lightly reddish yellow, dense, soft, malleable, and ductile metal.
What is the difference between atomic number and atomic mass ?Atomic number of an element is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.
atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.
Both Atomic mass and an atomic number of elements are closely related if atomic number is high, then the atomic mass is also said to be high.
For more details regarding fire atomic number , visit
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Help if u good at science lol
Why does the arrow labeled Fnorm point upward?
O A. Gravity pushes up.
O B. The statue pushes up.
O C. The ground pushes up.
O D. Air resistance pushes up.
Answer: The ground pushes up
Explanation:
Which of the following statement is true about the crust?
The crust is always made of different materials under the mountains than under the oceans.
The crust is the same thickness both under the mountains and oceans.
The crust is thinner under the mountains than under the oceans.
The crust is thinner under the oceans than under the mountains.
Answer:
The crust is always made of different materials under the mountains than under the oceans.
Explanation:
Right answer
Mark me as brilliant and thank you.
Among the given statements option 4 is correct. The crust is thinner under the oceans than under the mountains. The composition of earth crust should vary from that under oceans.
What is crust ?The earth crust is made of rocks and soil made of different elemental compositions. The crest properties in region may varies in each region. The continental thickness of crest is always thicker than the oceanic crest.
The layer of granitic, sedimentary, and metamorphic rocks that makes up the continental crust is what gives rise to the continents and the continental shelves, or shallow seafloor regions adjacent to their shores. Since it is less dense than the mantle material, it "floats" on top of it.
Even though it is significantly thicker—typically 35 to 40 km vs the average oceanic thickness of roughly 7 to 10 km—continental crust is less dense than oceanic crust. Currently, continental crust covers about 40% of the Earth's surface.
The thinnest continental crust is found in rift zones, where it is finally split and replaced by oceanic crust after thinned by detachment faulting. (both sides of the Atlantic Ocean, for example). Hence, option 4 is correct.
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define acids and base???
Answer:
An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond A base is a substance that can accept protons or donate a pair of valence electrons to form a bond.
Explanation:
Explanation:
An acid is a substance that donates protons (in the Brønsted-Lowry definition) or accepts a pair of valence electrons to form a bond (in the Lewis definition). A base is a substance that can accept protons or donate a pair of valence electrons to form a bond...........
An element with six electrons have the same number of?
Answer:
Protons
Explanation:
The number of electrons=the number of protons
Pls help me if your good at science:)remember I need two answer choices
Answer:
A and D, my bad
Explanation:
1 mole Fe2(CrO4)3 = ____g Fe2 (CrO4)3.
Answer:
459.6711 grams
Explanation: